Pipe removing tool



April 1965 N. F. JOHNSON 3,176,384

PIPE REMOVING TOOL Filed Sept. 3, 1963 INVENTOR NILS F, JOHNSON 5 BY flaw, JM,

ATTORNEYS United States Patent.

Filed Sept. 3, 1963, Ser. No. 306,18? 2 Claims. (Cl. 29-280) This invention relates to a tool for removing a pipe from position such, for instance, as the removing of a tail pipe from an automobile muffler nipple.

The mufiler of an automobile usually has a nipple extending out from one end into which there is forced a tail pipe for conducting the exhaust fumes from the mufller. The tail pipe usually fails prior to the muffler and it is necessary to remove the tail pipe from the mufller in order to put in a new one, and it is found that there is great difliculty in removing the tail pipe from the mufller due to the fact that there is adhesion between the two from rust and the like. The tail pipe is usually destroyed in the operation.

In the use of this invention, the tail pipe is cut off close to the muffler nipple and then the tool, which is the subject of this invention, is used for removing the tail pipe from the muffler nipple. The tool may be driven into the joint between the tail pipe and the mufiler nipple in such a way as to extend angularly to the axis of the nipple for starting a separation between the two and then rolling the tool about the inner edge of the nipple to collapse the tail pipe.

One of the objects of this invention is to start a separation between the tail pipe and muflier nipple.

Another object of the invention is to provide a tool which will be sufficiently strong so that it may be twisted to internally shrink and collapse the tail pipe.

Another object of the invention is to provide a blade which will project slightly beyond the end of the tool so that it may be more readily started into the joint between the muffler nipple and the tail pipe.

Another object of the invention is to provide means so that the blade which is formed in the tool will not easily crack or split away from the body of the tool.

Another object of the invention is to provide a means by which the tool may be readily grasped for rolling the tool to collapse the tail pipe.

With these and other objects in View, the invention consists of certain novel features of construction as will be more fully described and particularly pointed out in 'the appended claims.

In the accompanying drawings: FIG. 1 is a perspective view of the tool; FIG. 2 is an elevation of the end of the tool which is provided with the blade for collapsing the tail pipe;

FIG. 3 is a fragmental elevation showing the muflier, its nipple, and the tail pipe extending therefrom;

FIG. 4 illustrates the inserting of the blade in the joint between the tail pipe and the muflier nipple;

FIG. 5 is a sectional view of the tool as it is started into the joint between the tail pipe and the nipple of the 3,176,384 Patented Apr. 6, 1965 ice.

generally circular in cross section and I then provide a slot inwardly from the end of the bar and on a diagonal to the axis of the bar for a distance sufiicient to provide a wedge shaped blade at one side of the slot, which slot will terminate in a cross bore providing a curved surface at its inner end. This blade protrudes out beyond the end of the body for easier access into the joint between the mufiler nipple and the tail pipe and is also provided with a square or flattened surface at its opposite end so that it may be readily gripped by a tool such as a monkey Wrench or open-ended wrench and rolled for shrinking and collapsing the tail pipe.

With reference to the drawings, 10 designates a muffler having a nipple 11 extending from one end thereof and into this nipple there is located a tail pipe 12 which extends therefrom for conveying the exhaust fumes from the muflier.

In the use of the tool of this invention,I first cut ofl the tail pipe 12 close to the nipple 11 such as shown in FIG. 4 and I then utilize the tool designated generally 15 which comprises a solid cylindrical body 16 having an operating end portion 17 which is formed by the provision of a slot 13 extending inwardly on a diagonal as shown in FIG. 2 from the end 19 of the body. This slot terminates in a cross bore 20 extending laterally in the tool and of a size at least the size of the slot, although preferably slightly larger than the slot so as to provide curved portions 21 for greater strength against splitting of the stock at the termination of the slot.

The slot thus formed provides a wedge shaped blade 22 which I preferably carried beyond the end 19 as at 23 so that it may project sufliciently to have easy access between the junction of the nipple 11 and the tail pipe 12 when it is used. At the other end 24 of this tool there are flattened surfaces 25, 25 provided so that a wrench may be readily positioned on the tool for rolling or twisting the same.

In use the chisel like end 23 which projects beyond the end of the body at 19 is driven into the junction between the nipple 11 and the tail pipe 12 at the end 26 of the nipple by driving the wedge shaped blade 22 into this junction with a hammer. The portion 27 below the blade will be located as shown in FIG. 5 which illustrates the blade as just entering the junction of the two pieces. Further hammering will drive the blade further into this junction until the stock lodges Well Within the slot 18 or possibly the entire extent of the stock of the tube 12 may be located in the slot 18, then by rolling the tool or by twisting it, by the application of a wrench on the flats 25 the tool may be rolled along the inner surface 28 of the tail pipe so as to draw inwardly the portions 29 of the tail pipe shrinking it inwardly and thus collapsing it so that it is pulled away from the inner surface 30 of the nipple and by continued action of rolling the tool as shown in FIG. 6 the tail pipe may be completely removed from the mufiier.

I claim:

1. A tail pipe removing tool comprising an elongated generally cylindrical solid body with a slot extending inwardly from one end generally lengthwise of the body and at an angle to the axis of the body providing a wedge shaped blade and a rolling arbor, said wedge shaped blade adapted to be driven between the rear end of a mufller nipple and a tail pipe secured therein so as to cause the tooltolextendat an angle to the axis of the tail pipe and the muffler nipple when driven in, said body, at a location, spaced from said slotted end having flat portions for the reception of a Wrench to roll-the tool about the inner edge of the mufiler nipple to collapse the tail pipe to be removed and inwardly shrink the same and break it from the Inufiler nipple by bending and rolling it about said,

arbor. a V V V 2. A tail pipe removing tool as in claim 1 wherein the blade has its end protruding beyond the end of the tool 10 body.

References Cited'by the Examiner UNITED STATES PATENTS Putnam 81--15 .Colt 81-3 X 7 Brooks 8115 Bundy 81-15 WILLIA FELDMAN, Primary Examiner. MILTON s. MEHR, Exarniner. 

1. A TAIL PIPE REMOVING TOOL COMPRISING AN ELONGATED GENERALLY CYLINDRICAL SOLID BODY WITH A SLOT EXTENDING INWARDLY FROM ONE END GENERALLY LENGTHWISE OF THE BODY AND AT AN ANGLE TO THE AXIS OF THE BODY PROVIDING A WEDGE SHAPED BLADE AND A ROLLING ARBOR, SAID WEDGE SHAPED BLADE ADAPTED TO BE DRIVEN BETWEEN THE REAR END OF A MUFFLER NIPPLE AND A TAIL PIPE SECURED THEREIN SO AS TO CAUSE THE TOOL TO EXTEND AT AN ANGLE TO THE AXIS OF THE TAIL PIPE AND THE MUFFLER NIPPLE WHEN DRIVEN IN, SAID BODY AT A LOCATION SPACED FROM SAID SLOTTED END HAVING FLAT PORTIONS FOR THE RECEPTION OF A WRENCH TO ROLL THE TOOL ABOUT THE INNER EDGE OF THE MUFFLER NIPPLE TO COLLAPSE THE TAIL PIPE TO BE REMOVED AND INWARDLY SHRINK THE SAME AND BREAK IT FROM THE MUFFLER NIPPLE BY BENDING AND ROLLING IT ABOUT SAID ARBOR. 